"In the January issue of The Journal of Sexual Medicine, researchers have published a new investigation measuring sex hormone binding globulin (SHBG) before and after discontinuation of the oral contraceptive pill. The research concluded that women who used the oral contraceptive pill may be exposed to long-term problems from low values of "unbound" testosterone potentially leading to continuing sexual, metabolic, and mental health consequences. " Might want to check this article out - http://www.medicalnewstoday.com/releases/35663.php
Well, the upside is if you are pregnant, you don't have to worry about birth control and periods for a while.
Birth control can have you miss your period. My birth control will stop my period sometimes for 3 months in a row but if there is a chance you could be pregnant, take a test.